Automatic segmentation quality assessment for secondary treatment plans

Abstract

Provided herein are apparatuses (e.g., systems) and methods for assisting in generating and segmenting a 3D dental model of a subject's dentition. A 3D dental model may be generated from a dental scan. The apparatuses described herein can determine if the subject has previously undergone a dental or orthodontic treatment, and the 3D dental model can be compared to prior 3D dental models from the previous treatment(s). In some examples, the 3D dental model can be updated or supplemented with data from the prior 3D dental models.

What is claimed is: 
     
       1. A method for automated quality checking of a 3D model for digital treatment planning, the method comprising:
 receiving a current intraoral dental scan of a subject's dentition; 
 determining if the subject has previously undergone dental or orthodontic treatment including a prior treatment plan that was completed or discontinued; and 
 if the subject has previously undergone a dental or orthodontic treatment:
 generating an initial 3D segmented dental model from the current intraoral dental scan; 
 obtaining a prior dental model from the subject's previous dental or orthodontic treatment; 
 comparing dentition similarity criteria between the initial 3D segmented dental model and the prior dental model; and 
 modifying the initial 3D segmented dental model with one or more features of the prior dental model to improve a quality of the initial 3D segmented dental model based on the comparison of the dentition similarity criteria, wherein modifying the initial 3D segmented dental model includes inferring positions and/or forms of teeth from the prior dental model, to produce an updated dental model. 
 
 
     
     
       2. The method of  claim 1 , wherein modifying the initial 3D segmented dental model comprises using the one or more features of the prior dental model when the comparison of the dentition similarity criteria is less than a threshold value. 
     
     
       3. The method of  claim 1 , wherein comparing the dentition similarity criteria comprises comparing dentition criteria that are correlated to the one or more features of the initial 3D segmented dental model. 
     
     
       4. The method of  claim 1 , wherein the one or more features of the prior dental model comprises: a tooth axis, a region of a tooth surface, a facial axis of a clinical crown, or a tooth number. 
     
     
       5. The method of  claim 1 , wherein determining if the subject has previously undergone dental or orthodontic treatment further comprises searching a historical treatment database with non-scan information. 
     
     
       6. The method of  claim 1 , wherein if the subject has not previously undergone dental or orthodontic treatment, proceeding with a traditional dental modeling and segmentation process that includes a manual quality control check by a trained professional. 
     
     
       7. The method of  claim 1 , wherein the initial 3D segmented dental model comprises a 3D dental mesh model. 
     
     
       8. The method of  claim 1 , wherein the prior dental model is a final 3D model from the subject's previous dental or orthodontic treatment. 
     
     
       9. The method of  claim 1 , wherein the dentition similarity criteria are based on multiple treatment plan parameters that were applied during the subject's previous dental or orthodontic treatment. 
     
     
       10. The method of  claim 1 , wherein the dentition similarity criteria are one or more of an overall number of teeth, a tooth geometry in different areas, teeth numeration, or a number of treated jaws. 
     
     
       11. The method of  claim 1 , wherein the dentition similarity criteria are references representing tooth shape similarity from the subject's previous dental or orthodontic treatment. 
     
     
       12. The method of  claim 1 , wherein the dentition similarity criteria are references representing expected tooth motion trajectory from the subject's previous dental or orthodontic treatment. 
     
     
       13. The method of  claim 1 , wherein comparing the dentition similarity criteria further comprises calculating a rigid transformation of teeth in the initial 3D segmented dental model having references matching shapes to corresponding teeth in the prior dental model. 
     
     
       14. The method of  claim 1 , wherein modifying the initial 3D segmented dental model further comprises restoring missing anatomy with shape data from the prior dental model. 
     
     
       15. The method of  claim 1 , wherein modifying the initial 3D segmented dental model further comprises updating teeth axes with axes data from the prior dental model. 
     
     
       16. The method of  claim 1 , wherein modifying the initial 3D segmented dental model further comprises performing initial tooth matching using teeth relative positions between the initial 3D segmented dental model and the prior dental model. 
     
     
       17. The method of  claim 1 , wherein modifying the initial 3D segmented dental model further comprises performing precise tooth matching using geometric tooth features between the initial 3D segmented dental model and the prior dental model. 
     
     
       18. The method of  claim 1 , wherein modifying the initial 3D segmented dental model further comprises removing interproximal area collisions in the initial 3D segmented dental model based on the prior dental model. 
     
     
       19. The method of  claim 1 , wherein modifying the initial 3D segmented dental model further comprises correcting tooth shapes and gingival lines using borders based on the prior dental model. 
     
     
       20. The method of  claim 1 , wherein modifying the initial 3D segmented dental model further comprises enumerating the initial 3D segmented dental model with a numeration of the prior dental model. 
     
     
       21. The method of  claim 1 , further comprising automatically trimming the updated dental model based on a trim line of the prior dental model. 
     
     
       22. A non-transitory computer-readable medium including contents that are configured to cause one or more processors to perform a method for automated quality checking of a 3D model for digital treatment planning, comprising:
 receiving a current intraoral dental scan of a subject's dentition; 
 determining if the subject has previously undergone dental or orthodontic treatment including a prior treatment plan that was completed or discontinued; and 
 if the subject has previously undergone dental or orthodontic treatment:
 generating an initial 3D segmented dental model from the current intraoral dental scan; 
 obtaining a prior segmented dental model from the subject's previous dental or orthodontic treatment; 
 comparing dentition similarity criteria between the initial 3D segmented dental model and the prior segmented dental model; and 
 modifying the initial 3D segmented dental model with one or more features of the prior segmented dental model to improve a quality of the initial 3D segmented dental model based on the comparison of the dentition similarity criteria, wherein modifying the initial 3D segmented dental model includes inferring positions and/or forms of teeth from the prior segmented dental model, to produce an updated dental model. 
 
 
     
     
       23. A non-transitory computer-readable medium including contents that are configured to cause one or more processors to perform a method for automated quality checking of a 3D model for digital treatment planning, comprising:
 generating an initial 3D segmented dental model from a current intraoral dental scan of a subject's dentition; 
 comparing dentition similarity criteria between the initial 3D segmented dental model from the current intraoral dental scan and a prior dental model including a prior treatment plan that was completed or discontinued; and 
 modifying the initial 3D segmented dental model from the current intraoral dental scan with one or more features from the prior dental model to improve a quality of the initial 3D segmented dental model based on the comparison of the dentition similarity criteria, wherein modifying the initial 3D segmented dental model includes inferring positions and/or forms of teeth from the prior dental model, to produce an updated dental model; 
 displaying the updated dental model in which the one or more features from the prior dental model are marked; and 
 permitting a user to modify the updated dental model from the display, but preventing the user from modifying the marked one or more features.